JP2007064398A - Intermittent taking up unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the axial size of an entire unit in a taking up unit having a one-way clutch for taking up and a one-way clutch for preventing reverse rotation. <P>SOLUTION: In this intermittent taking up unit, the one-way clutch 23 for taking up and the one-way clutch 31 for preventing reverse rotation are interposed between a swing member 11 and a taking up member 19. The one-way clutch 23 for taking up comprises pockets 27 formed in the inner diameter surface of an outer ring member 24 fitted to the outer diameter surface of a sleeve 7 formed integrally with the swing member 11 and rollers 25 stored in the pockets. The one-way clutch 31 for preventing reverse rotation comprises a cam ring 32 formed integrally with the outer diameter surface of the outer ring member 24 and having pockets 35 axially facing the side plate 3 of a fixed shaft 2 and balls 33 stored in the pockets 35. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an intermittent winding unit used in a tape feeder unit or the like, and is particularly intended to make the axial direction compact.

  In the tape feeder unit mounted on the chip mounter, the transport tape containing the electronic components is intermittently sent, and the top tape that acts as a lid for the transport tape is peeled off, and the stripped top tape is intermittent A take-up unit is provided for taking up.

As such an intermittent winding unit, a swinging member on the input side and a winding member on the output side are rotatably mounted on a fixed shaft, and the winding member is wound between the swinging member and the winding member. And a one-way clutch for preventing reverse rotation is interposed between the winding member and the fixed shaft, respectively. The one-way clutch for winding is a winding direction of the swinging member. The one-way clutch for preventing reverse rotation is configured so as to be free when rotating in the winding direction of the winding member. One is known (Patent Document 1).
Japanese Patent Laid-Open No. 2001-41265 (FIG. 1)

  The intermittent winding unit disclosed in Patent Document 1 has a problem of lack of axial compactness because two types of one-way clutches for winding and for preventing reverse rotation are arranged side by side in the axial direction. .

  Therefore, an object of the present invention is to provide an intermittent winding unit that achieves axial compactness by combining the two one-way clutches in a coaxial state, that is, in a radial direction.

  In order to solve the above-mentioned problem, as shown in FIG. 1, the present invention is configured such that an input-side swing member 11 and an output-side winding member 19 are rotatably mounted on a fixed shaft 2, and A one-way clutch 23 for winding is interposed between the moving member 11 and the winding member 19, and a one-way clutch 31 for preventing reverse rotation is interposed between the winding member 19 and the fixed shaft 2, respectively. When the swinging member 11 swings in the winding direction, the one-way clutch 23 for winding is locked to transmit a winding torque, and the one-way clutch 31 for preventing reverse rotation has a directivity. The intermittent winding unit is used as a premise.

  In addition, according to the present invention, the one-way clutch 23 for winding is provided with a pocket 27 facing the outer diameter surface of the sleeve 7 integral with the swinging member 11, and deep in the radial direction on the bottom surface of the pocket 27. The outer ring member 24 is formed with a winding-side cam surface 28 of varying height, and the rolling elements (rollers) 25 are accommodated in the pockets 27. Further, the one-way clutch 31 for preventing reverse rotation is provided integrally with an outer diameter surface of the outer ring member 24 and includes a pocket 35 that is opposed to the side plate 3 of the fixed shaft 2 in the axial direction. The cam ring 32 is formed with a reverse rotation prevention cam surface 36 whose depth varies in the axial direction on the bottom surface, and a rolling element (ball) 33 accommodated in the pocket 35.

  The winding cam surface 28 is inclined in a direction in which the rolling element 25 is locked when the swinging member 11 swings in the winding direction, and the reverse rotation prevention cam surface 36 is wound around the swinging member 11. In this configuration, the rolling element 33 is inclined in a free direction when swinging in the take-off direction.

    In the intermittent winding unit of the present invention, when the swinging member 11 is swung in the direction of the arrow a shown in FIG. Torque is transmitted by locking, and the winding member 19 is rotated in the winding direction A (see FIGS. 2 and 3). As a result, winding of one pitch of the top tape is performed. At this time, the one-way clutch 31 for preventing reverse rotation is free. When the swing member 11 is swung in the direction of the arrow b, the one-way clutch 23 for winding is released and the swing member 11 returns to its original state. In the one-way clutch 31 for preventing reverse rotation, the ball 33 moves and locks in the direction of the wedge angle δ, thereby preventing reverse rotation of the winding member 19.

  Since the intermittent winding unit of the present invention is provided with the one-way clutch 31 for preventing reverse rotation on the outer diameter surface of the one-way clutch 23 for winding as described above, the axial size of the entire unit is compact. There is an effect to be. Further, the winding member 19 is rotatably fitted to the outer diameter surface of the sleeve 7 via the bearing member 17, and the open end inner diameter surface of the boss portion 22 of the winding member 19 is the side plate 3 of the fixed shaft 2. The one-way clutches 23 and 31 are compactly constructed by incorporating the one-way clutches 23 and 31 for winding and preventing reverse rotation between the side plate 3 and the bearing member 17. Can be incorporated into.

  When the swinging member 11 returns from the winding state to the original state, the one-way clutch 31 for preventing reverse rotation is locked to prevent the winding member 19 from rotating in reverse. Is not affected, the torque when the swinging member 11 returns to the original state does not change.

  Furthermore, the number of parts can be reduced by forming the outer ring member 24 of the one-way clutch 23 for winding and the cam ring 32 of the one-way clutch 31 for preventing reverse rotation as an integral part.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The intermittent winding unit of the embodiment shown in FIGS. 1 to 4 has a fixed shaft 2 fixed to the housing 1. The fixed shaft 2 is provided with a disk-shaped side plate 3 on the front end surface, and an end surface provided with a screw hole 4 on the opposite side is pressed against the inner surface of the housing 1, and a bolt 5 screwed from the outer surface of the housing 1. It is fixed to the housing 1.

  A sleeve 7 is rotatably fitted between the housing 1 and the outer diameter surface of the fixed shaft 2 via a spacer 6. The sleeve 7 is provided with a collar 9 having a D-cut portion 8 (see FIG. 4A) on the outer diameter surface of the end portion on the housing 1 side, and a swinging member 11 as an input member is fitted into the collar 9. .

  As shown in FIGS. 2 and 4, the rocking member 11 has a boss portion 13 having a D-cut hole 12 fitted into the collar 9 of the sleeve 7, and a downward direction from the outer peripheral edge of the boss portion 13. The first swing arm 14 extending to the side and the second swing arm 15 extending to the side are provided. A link mechanism (not shown) is connected to the tip of the first swing arm 14 and is driven with a fixed swing angle as shown by arrows a and b in FIG. A coil spring 16 is interposed between the distal end of the second swing arm 15 and the housing 1. The coil spring 16 expands and contracts according to the swinging direction of the arrows a and b to exert a spring force. The sleeve 7 and the swing member 11 may be formed as an integral part.

  An annular bearing member 17 is rotatably fitted inside the collar 9 of the sleeve 7. The bearing member 17 is provided with a fitting rib 18 on the outer diameter surface, and is fitted and fixed in a fitting groove 21 (see FIG. 4A) on the inner diameter surface of the winding member 19 as an output side member. The winding member 19 is rotatably supported integrally with the bearing member 17. In the drawing, the winding member 19 is shown as a gear, and is coupled to a winding pulley (not shown). The gear coupling may be omitted, and the winding member 19 may be a pulley itself.

  An annular boss portion 22 is provided on the surface of the winding member 19 opposite to the housing 1, and the side plate 3 of the fixed shaft 2 enables rotation of the winding member 19 on the inner diameter surface of the open end. The side plate 3 is fitted with a gap and the open end of the boss portion 22 is closed.

  As shown in FIG. 1A, the clutch mechanism is housed in a portion surrounded by the side plate 3 and the bearing member 17, and the sleeve 7 and the boss portion 22. The clutch mechanism includes a one-way clutch 23 for winding and a one-way clutch 31 for preventing reverse rotation.

  The one-way clutch 23 for winding includes an outer ring member 24 that is rotatably fitted to the outer diameter surface of the sleeve 7, a large number of rollers 25, and a roller urging spring 26. A required number of pockets 27 are provided on the inner surface of the outer ring member 24 at regular intervals in the circumferential direction (see FIG. 3).

  A winding side cam surface 28 is formed on the bottom surface of the pocket 27. The winding-side cam surface 28 is inclined so that the depth of the bottom surface gradually decreases in the radial direction when viewed in the swinging direction when the swinging member 11 is wound (see arrow a in FIGS. 2 and 3). The wedge angle θ in the radial direction is formed by the inclination. The roller 25 is urged by a roller urging spring 26 in a direction in which a wedge angle θ is formed.

  In the one-way clutch 23 for winding, when the swinging member 11 swings in the winding direction (arrow a direction), the roller 25 is engaged and locked in the wedge angle θ, and the opposite direction (arrow b). When the roller 25 is swung in the direction), the roller 25 is disengaged and the lock is released to become free. A rotation-preventing groove 29 is provided in the axial direction on the outer diameter surface of the outer ring member 24.

  The one-way clutch 31 for preventing reverse rotation is provided on the outer diameter surface of the outer ring member 24. The one-way clutch 31 includes a cam ring 32, a required number of balls 33, and a ball biasing spring 34.

  The cam ring 32 is provided with pockets 35 (see FIG. 1B) on the end surface facing the side plate 3 at regular intervals in the circumferential direction, and a reverse rotation prevention cam surface 36 is formed on the bottom surface in the axial direction. Is done. The reverse-rotation-preventing cam surface 36 has a bottom surface whose depth gradually increases in the axial direction when viewed in the swinging direction (see arrows a in FIGS. 1B, 2 and 3) when the swinging member 11 is wound. And the wedge angle δ in the axial direction is formed by the inclination. The ball 33 is urged by the ball urging spring 34 in the direction of the wedge angle δ. When the ball 33 moves relative to the direction in which the wedge angle δ is formed, the one-way clutch 31 for preventing reverse rotation is in a locked state, and conversely, when the ball 33 moves relative to the wedge angle δ in the opposite direction, it becomes a free state.

  The cam ring 32 is integrated with the outer ring member 24 in the rotation direction by fitting an axial rotation-preventing rib 37 formed on the inner diameter surface of the cam ring 32 into the groove 29 of the outer ring member 24. Further, a rotation-preventing groove 38 is formed on the outer diameter surface of the cam ring 32 in the axial direction, and is fitted to a rib 39 formed on the inner diameter surface of the boss portion 22 of the winding member 19 so as to be integrated in the rotation direction. Is done.

  As shown in FIG. 4B, the outer ring member 24 and the cam ring 32 are formed by an integral part, that is, a clutch part 41, and are wound around the inner diameter surface of the clutch part 41. The one-way clutch 23 may be configured, and the one-way clutch 31 for preventing reverse rotation may be configured on the axial end surface on the outer diameter side.

  Further, as shown in FIG. 5A, the winding member 19 may be configured by a combination of divided bodies 19 a and 19 a that are divided into two by a plane including the rotation center line. In this case, each divided body 19a is provided with a divided boss portion 22a having a divided shape of the boss portion 22, and one of the butted surfaces of the divided boss portion 22a is engaged with the engaging claw 42 for the other divided body 19a. An engaging portion 43 corresponding to the joint claw 42 is provided. Each divided body 19a is formed in the same shape. FIG. 5B shows a state where the engaging claw 42 and the engaging portion 43 are engaged.

  The intermittent winding unit of the embodiment is configured as described above, and the operation thereof will be described next.

  When the oscillating member 11 is oscillated in the direction of arrow a shown in FIG. 2, the sleeve 7 integrated with the oscillating member 11 rotates in that direction, so that the roller 25 is relatively moved in the direction of the wedge angle .theta. (See FIG. 3). As a result, the winding one-way clutch 23 is locked, torque is transmitted through the outer ring member 24 and the cam ring 32 integral therewith, and the winding member 19 is wound in the winding direction A (see FIGS. 2 and 3). ) To rotate. As a result, winding of one pitch of the top tape is performed. At this time, the one-way clutch 31 for preventing reverse rotation becomes free because the ball 33 moves relatively in the direction opposite to the wedge angle δ and does not hinder winding.

  Next, when the swinging member 11 is swung in the direction of arrow b, the one-way clutch 23 for winding becomes free as a result of the relative movement of the roller 24 in the direction opposite to the wedge angle θ, and the swinging member 11 is wound. It rotates together with the sleeve 7 without applying reverse torque to the take-up member 19 and returns to the original state. In this case, if torque in the reverse direction is applied to the winding member 19 from the top tape or the like, the ball 33 moves in the direction of the wedge angle δ in the one-way clutch 31 for preventing reverse rotation, and the side plate 3 is moved. The locked state prevents the winding member 19 from reversing, but the locking does not affect the rotation of the sleeve 7 and the swinging member 11 integral therewith, so that the swinging member 11 is returned to its original state. There will be no fluctuation in torque.

(A) Longitudinal side view of the embodiment, (b) Enlarged sectional view taken along line bb of (a) figure Sectional view along line XX in FIG. FIG. 1 is a partially omitted enlarged cross-sectional view taken along line YY in FIG. (A) Exploded perspective view of the embodiment, (b) Partial perspective view of the modified example same as above. (A) Partially exploded perspective view of another modified example of the embodiment, (b) Partially enlarged sectional view of the combined state of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Fixed shaft 3 Side plate 4 Screw hole 5 Bolt 6 Spacer 7 Sleeve 8 D cut part 9 Collar 11 Swing member 12 D cut hole 13 Boss part 14 Swing arm 15 Swing arm 16 Coil spring 17 Bearing member 18 Fitting Rib 19 Winding member 21 Fitting groove 22 Boss portion 23 One-way clutch 24 Outer ring member 25 Roller 26 Roller biasing spring 27 Pocket 28 Winding side cam surface 29 Groove 31 One-way clutch 32 Cam ring 33 Ball 34 Ball biasing spring 35 Pocket 36 Reverse rotation prevention cam surface 37 Rib 38 Groove 39 Rib 41 Clutch component 42 Engaging claw 43 Engaging portion

Claims (4)

An input-side swinging member (11) and an output-side winding member (19) are rotatably mounted on the fixed shaft (2), and between the swinging member (11) and the winding member (19). A one-way clutch (23) for winding, and a one-way clutch (31) for preventing reverse rotation between the winding member (19) and the fixed shaft (2). The one-way clutch (23) for winding is locked at the time of swinging in the winding direction of (11), and the one-way clutch (31) for preventing reverse rotation has a directivity that is free. In the unit
The one-way clutch (23) for winding is provided with a pocket (27) opposed to the outer diameter surface of the sleeve (7) integral with the swing member (11), and at the bottom surface of the pocket (27) in the radial direction. And an outer ring member (24) having a winding side cam surface (28) whose depth is changed, and a rolling element (25) housed in the pocket (27). The direction clutch (31) includes a pocket (35) provided integrally with the outer diameter surface of the outer ring member (24) and facing the side plate (3) of the fixed shaft (2) in the axial direction. The cam ring (32) is formed with a cam surface (36) on the reverse rotation prevention side whose depth varies in the axial direction on the bottom surface of the pocket (35), and a rolling element (33) housed in the pocket (35). ,
The winding cam surface (28) is inclined in a direction in which the rolling element (25) is locked when the swinging member (11) swings in the winding direction, and the reverse rotation preventing cam surface (36) The intermittent winding unit is characterized in that the rolling element (33) is inclined in a free direction when the swinging member (11) swings in the winding direction.   The winding member (19) is rotatably fitted to the outer diameter surface of the sleeve (7) via a bearing member (17), and the open end inner diameter of the boss portion (22) of the winding member (19). The surface is closed by the side plate (3) of the fixed shaft (2), and the one-way clutches (23) for winding and for preventing reverse rotation are provided between the side plate (3) and the bearing member (17). The intermittent winding unit according to claim 1, wherein 31) is incorporated. The outer ring member (24) of the one-way clutch (23) for winding and the cam ring (32) of the one-way clutch (31) for preventing reverse rotation are formed as an integral part. Or the intermittent winding unit of 2.   The winding member (19) is formed by a combination of divided bodies (19a) divided into two on the plane including the rotation center line, and the other divided body (19a) is provided on one of the butted surfaces of each divided body (19a). The intermittent take-up unit according to any one of claims 1 to 3, further comprising an engagement claw (42) with respect to the engagement claw (42) and an engagement portion (43) corresponding to the engagement claw (42).

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